Improvement in purifying acetic acid



"lyn, in theicount fclare that the following a fu @wat demise.

mag/ concern *Be it at I, THOMAS L. OLDN, of Brook-v of King "id State yof New York, have invented ja n prand oved Process of Purityn ing Acct-ic or Pyirol 'l;` and I do hereby deand exact description My invention consists in making and purifying acetic or pyroligneons acid Vby "onelprocess of distillation, which `is conducted asfollows:

'l The materials ordinarily employed for the production of acetic' acid, vizt' acetatelof lime and muriatic acid, are introduced into the usual distillatory apparatus, the muriatic acid being `employed in such proportonas to remin'inslight excess.

1 The vapors evolved duringdistillation, consisting of acetic and muriatic acids, accompanied by empyreumatic impurities, are conducted into a suitable receptacle containing black or` binoxide of manganese, so

ar'rangedin small -f'ragments as to permit the vapor to pass freely, while all portionsfthereof shall come in contact withsthe binoxide. l

By this' means the m uriatic-acid vapor is decom posed l with evolution of chlorine, which, in its nascent state, at once attacks and destroys the empyreumatic inat-4 ter, `leaving the produca-after proper condensation in the usual refrgeratory apparatus, free from empyreuma,

` and ready for use in its various applicationsintlle arts,

`THoMAs-l-LQ onnnng` `or BRooKLYN,A `NEW YORK. ,i

'Letters .Patent No. 100,553, dated lila-relis, 1870.

" IMPRQVMNT PRIFYING- CETIC ACID.

- The Schedule referred to in these lhetters Patent and making part of the same If sulphuric acid and an acetate are to be used in the production of acetic acid, Ivadd a slight excess of muria'tie acid 'to the mixture, and proceed as above. .Or an excess of sulphur-ic acid-and the eqnivalent'pro .portion of chloride of sodinm,.or other chloride may be used to produce the-required amount of muriatic vapor. i

- If I desire to purify crude pyroligneous acid,.as obtained by the destructive distillation `ot' wood, I add thereto about three per cent. of muriatic acid at 20o Baume, and proceed in the manner already described. Ora certain proportion of crude pyr'oligneons acid may be added to the materials used for the production of acetic acid, and the whole distilled together in the man ner described.

Having thus described my invention,

What I claim as new, anddesire to secure; by Letters 2. The use of binoxide of' manganese in purifying acetic-acid vapor, in the manner set forth.

" THOMAS L. OLDEN.'

Witnesses: Y

G. B. RonBINs, JOHNH. LA RozA. 

